Emotions shape the landscape of our mental and social lives. Like geological upheavals in a landscape, they mark our lives as uneven, uncertain and prone to reversal. Are they simply, as some have claimed, animal energies or impulses with no connection to our thoughts? Or are they rather suffused with intelligence and discernment, and thus a source of deep awareness and understanding? In this compelling new book, Martha C. Nussbaum presents a powerful argument for treating emotions not as alien forces but as highly discriminating responses to what is of value and importance. She explores and illuminates the structure of a wide range of emotions, in particular compassion and love, showing that there can be no adequate ethical theory without an adequate theory of the emotions. This involves understanding their cultural sources, their history in infancy and childhood, and their sometimes unpredictable and disorderly operations in our daily lives.